We study the intermittency and noise of dislocation systems undergoing shear deformation. Simulations of a simple two-dimensional discrete dislocation dynamics model indicate that the deformation rate exhibits a power spectrum scaling of the type 1/fα. The noise exponent is far away from a Lorentzian, with α≈1.5. This result is directly related to the way the durations of avalanches of plastic deformation activity scale with their size.
@article{arxiv.cond-mat/0611442,
title = {$1/f$ noise and avalanche scaling in plastic deformation},
author = {Lasse Laurson and Mikko Alava},
journal= {arXiv preprint arXiv:cond-mat/0611442},
year = {2009}
}